posted November 29, 201203:49 AM
WD-40 is fine if it's what you've got, but it's not a particularly great lubricant. It was designed as a water displacer (hence the "WD") and its lubricating qualities, such as they are, are an incidental byproduct of that function.

For general household lubrication of things like squeaky hinges and locks, I use Tri-Flow.
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posted November 29, 201204:21 AM
While cooking oil will probably at least temporarily silence a squeak, it will spoil and potentially produce a foul odor. More to the point it will get really sticky and attract dust, potentially making your hinge worse off than when you started.
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